| Year | 1952 |
| Date | 18-Sep |
| Volume | 107 |
| Issue | 2,678 |
| Page | 377 |
| Category | Drilling |
| Part | |
| Title | A Twist Drill Point Grinding Jig |
| Author | W.D.Arnot |
| Notes | Patterns for the final jig, swing block and sectors, general arrangement, elevation and plan, sector finishing, groove cutting gauge, grooving refinement |